Effect of annealing on phase composition,structural and magnetic properties of Sm-Co based nanomagnetic material synthesized by sol-gel process |
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Authors: | G Suresh P Saravanan D Rajan Babu |
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Institution: | 1. Advanced Materials Research Centre, School of Advanced Sciences, VIT University, Vellore 632 014, India;2. Defence Metallurgical Research Laboratory, Hyderabad 500 058, India |
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Abstract: | Sm-Co based nanomagnetic material was synthesized by means of a Pechini-type sol-gel process. In this method, a suitable gel-precursor was prepared using respective metal salts and complexing agent such as citric acid. The gel-precursor was dried at 300 °C and then subjected to various reductive annealing temperatures: 350, 500 and 600 °C. The nanopowders so obtained were characterized for their structure, phase composition and magnetic properties. FT-IR studies on the gel-precursor showed the binding of metal cations with the citrate molecules in the form of metal-citrate complex. The gel-precursor, which was annealed at 350 °C showed the presence of both meta-stable cobalt carbide (Co2C, Co3C) and Co3O4 phases; while the sample annealed at 500 °C indicated the sign of SmCo5 phase. Upon increasing the reductive annealing temperature to 600 °C, crystalline phase such as fcc-Co and Sm2C3 were formed prominently. FE-SEM analysis revealed the change in sample morphology from spherical to oblate spheres upon increasing the annealing temperature. VSM measurements demonstrated ferromagnetic nature at room temperature for all the nanopowders obtained irrespective of their after reductive annealing temperature. |
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Keywords: | Chemical synthesis Sol-gel process Samarium cobalt Magnetic nanoparticle |
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